G to A nucleotide substitution affects a splice-acceptor site resulting in a frameshift by one base in the mRNA. The progenitor P{EP}Mkp311 insertion is still present on the chromosome.
G19069890A
The mutation occurs in a splice acceptor site and leads to a 1 bp frameshift in the CDS as confirmed by sequence analysis of cDNA.
Selected as: a revertant of the phenotype caused by overexpression from the P{EP}Mkp311 insertion.